int32 aid
uint8 NULLSTATE=0
uint8 lanechange_state

uint8 steering_state
uint8 STR_LEFT=1
uint8 STR_RIGHT=2
uint8 STR_STRAIGHT=3

uint8 accel_state
uint8 stopline_state
  uint8 TYPE_NULL=0
  uint8 TYPE_STOPLINE=1
  uint8 TYPE_STOP=2
# 1 is stopline, 2 is stop which 2 can only be released manually.
uint64 event_state
